RF signal separation and suppression system and method

Abstract

A radio frequency (RF) signal separation and suppression system includes an input that couples in a radio frequency signal comprising desired and undesired radio frequency signals. The RF signal separation and suppression system also includes a reproduction generator connected to the input. The reproduction generator produces a reproduction from the radio frequency signal of the undesired signal at an output. The RF signal separation and suppression system also includes an electrical subtractor having a first input that is electrically connected to the output of the reproduction generator and a second input that is electrically connected to the input of the radio frequency signal separation system. An output of the subtractor generates an output radio frequency signal comprising the desired radio frequency signal and a suppressed undesired radio frequency signal.

What is claimed is: 
     
       1. A radio frequency (RF) signal separation and suppression system comprising:
 a) an input to the RF signal separation and suppression system that couples a radio frequency signal comprising desired and interference radio frequency signals; 
 b) a reproduction generator having a first input connected to the RF signal separation and suppression system input and having a parameter generator that generates signal parameters of the interference radio frequency signal that are determined a priori and having a basis function generator that generates a linear combination of weighted basis functions using the generated signal parameters that are determined a priori, the reproduction generator producing a reproduction of the interference radio frequency signal at an output using the linear combination of weighted basis functions; and 
 c) an electrical subtractor having a first input that is electrically connected to the output of the reproduction generator and a second input that is electrically connected to the RF signal separation and suppression system input, the electrical subtractor generating an output radio frequency signal comprising the desired radio frequency signal and a suppressed interference radio frequency signal at an output. 
 
     
     
       2. The radio frequency signal separation and suppression system of  claim 1  wherein the radio frequency signal comprises up-link and down-link RF-carrier signals in cellular telephony systems. 
     
     
       3. The radio frequency signal separation and suppression system of  claim 1  wherein the desired radio frequency signal comprises a down-link signal to a user's mobile telephony handset and the interference signal comprises up-link signals transmitting from mobile telephony handset proximate to the user's mobile telephony handset. 
     
     
       4. The radio frequency signal separation and suppression system of  claim 1  wherein the signal parameters comprise at least one of a sampling frequency, a number of samples per bit, a sampling interval, and a number of bits to examine. 
     
     
       5. The radio frequency signal separation and suppression system of  claim 1  wherein the signal parameters comprise signal parameters that accommodate the radio frequency signals comprising interference radio frequency signals having twelve subcarriers spaced 15 kHz apart. 
     
     
       6. The radio frequency signal separation and suppression system of  claim 1  wherein the signal parameters comprise signal parameters that cause the subtractor to generate an output radio frequency signal comprising the desired radio frequency signal and the interference radio-frequency signals suppressed by eight orders of magnitude. 
     
     
       7. A method of radio frequency (RF) signal separation and suppression, the method comprising:
 a) sensing a radio frequency signal comprising desired and interference radio frequency signals; 
 b) processing the sensed radio frequency signal; 
 c) electrically correlating the processed sensed radio frequency signal using a combination of un-modulated carriers at known frequencies of a distinguishable part of the interference radio frequency signals that are determined a priori and are generated by a basis function generator that generates a linear combination of weighted basis functions using the generated signal parameters that are determined a priori to generate a correlated signal which has amplitudes and phases at known frequencies of the distinguishable part of the interference radio frequency signals; 
 d) inverse processing the correlated signal to generate a reproduction of the distinguishable part of the interference radio frequency signal; and 
 e) subtracting the reproduction of the distinguishable part of the interference radio frequency signal from the radio frequency signal, thereby generating a radio frequency signal comprising the desired radio frequency signal and a suppressed interference radio frequency signal. 
 
     
     
       8. The method of RF signal separation and suppression of  claim 7  wherein the correlated signal comprises only amplitudes and phases that are not at desired signal frequencies. 
     
     
       9. The method of RF signal separation and suppression of  claim 7  wherein the processing the sensed radio frequency signal comprises processing the sensed radio frequency signal in the frequency domain and the inverse processing the correlated signal comprises inverse processing the correlated signal in the frequency domain. 
     
     
       10. The method of RF signal separation and suppression of  claim 9  wherein the processing the sensed radio frequency signal comprises Fourier transform processing and the inverse processing the correlated signal comprises inverse Fourier transform processing. 
     
     
       11. The method of RF signal separation and suppression of  claim 10  wherein the processing the sensed radio frequency signal further comprises integral transform processing the sensed radio frequency signal. 
     
     
       12. The method of RF signal separation and suppression of  claim 7  wherein the distinguishable part of the interference radio frequency signal comprises a center frequency of the interference radio frequency signal. 
     
     
       13. The method of RF signal separation and suppression of  claim 7  wherein the distinguishable part of the interference radio frequency signal comprises a bandwidth of the interference radio frequency signal. 
     
     
       14. The method of RF signal separation and suppression of  claim 7  wherein the input RF signal comprises up-link and down-link RF-carrier signals in cellular telephony systems. 
     
     
       15. The method of RF signal separation and suppression of  claim 14  wherein the desired radio frequency signal comprises a down-link signal to a user's mobile telephony handset and the interference radio frequency signal comprises up-link signals transmitting from at least one mobile telephony handset proximate to the user's mobile telephony handset. 
     
     
       16. The method of RF signal separation and suppression of  claim 14  wherein the distinguishable part of the interference radio frequency signal comprises subcarriers spaced 15 kHz apart. 
     
     
       17. The method of RF signal separation and suppression of  claim 7  wherein the suppressed interference radio frequency signal is suppressed by at least eight orders of magnitude. 
     
     
       18. A radio frequency (RF) signal separation and suppression system comprising:
 a) an input of the RF signal separation and suppression system that senses an RF-modulated down-link signal and at least one RF-modulated up-link signal; 
 b) a reproduction generator connected to the input of the RF signal separation and suppression system, the reproduction generator processing the RF-modulated down-link signal and the at least one RF-modulated up-link signal using signal parameters of the RF-modulated up-link signal that are determined a priori and a linear combination of weighted basis functions that are based on the signal parameters of the RF-modulated up-link signal that are determined a priori, and producing a reproduction of the at least one RF-modulated up-link signal at an output using the linear combination of weighted basis functions; and 
 c) an electrical subtractor having a first input that is electrically connected to the output of the reproduction generator and a second input that is electrically connected to the input of the RF signal separation and suppression system, the subtractor generating an output radio frequency signal comprising the RF-modulated down-link signal and a suppressed at least one RF-modulated up-link signal at an output. 
 
     
     
       19. The radio frequency (RF) signal separation and suppression system of  claim 18  wherein the RF-modulated down-link signal and the at least one RF-modulated up-link signal operate at the same time. 
     
     
       20. The radio frequency (RF) signal separation and suppression system of  claim 18  wherein the RF-modulated down-link signal and the at least one RF-modulated up-link signal operate at the same frequency. 
     
     
       21. The radio frequency (RF) signal separation and suppression system of  claim 18  wherein the at least one RF-modulated up-link signal comprises multiple RF-modulated up-link signals and the reproduction generator produces a reproduction of a vector sum of the multiple RF-modulated up-link signals at the output. 
     
     
       22. The radio frequency (RF) signal separation and suppression system of  claim 21  wherein the reproduction of the vector sum of the multiple RF-modulated up-link signals at the output comprises one reproduction of an aggregate of the multiple RF-modulated up-link signals.